Hello can you me posted picture of question

The correct answer is A.

The sum of outcomes of the complimentary events always equal the elements of the sample space.

For example:
Sample space of tossing coin = {H, T}
Getting a head = {H}
Its compliment is getting a tail = {T}

See the elements in the complements are the ones which are in sample space.

So, the answer is option A

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Answer is either b or c